电波对时
来自Jack's Lab
（版本间的差异）
(→England) |
(→Reference) |
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| （未显示1个用户的24个中间版本） | |||
| 第3行： | 第3行： | ||
=== China === | === China === | ||
| − | 68.5KHz | + | Freq: 68.5KHz |
| − | BPC | + | Code: BPC |
| − | NTSC | + | Ops: NTSC |
https://en.wikipedia.org/wiki/BPC_(time_signal) | https://en.wikipedia.org/wiki/BPC_(time_signal) | ||
| 第15行： | 第15行： | ||
=== Japan === | === Japan === | ||
| − | 40KHz/60KHz | + | Freq: 40KHz/60KHz |
| − | JJY | + | Code: JJY |
| − | NICT | + | Ops: NICT |
* http://jjy.nict.go.jp/ | * http://jjy.nict.go.jp/ | ||
| 第28行： | 第28行： | ||
=== USA === | === USA === | ||
| − | 60KHz | + | Freq: 60KHz |
| − | WWVB | + | Code: WWVB |
| − | NIST | + | Ops: NIST |
* https://en.wikipedia.org/wiki/WWVB | * https://en.wikipedia.org/wiki/WWVB | ||
| 第41行： | 第41行： | ||
=== England === | === England === | ||
| − | 60KHz | + | Freq: 60KHz |
| − | MSF | + | Code: MSF |
| − | NPL | + | Ops: NPL |
* https://en.wikipedia.org/wiki/Time_from_NPL | * https://en.wikipedia.org/wiki/Time_from_NPL | ||
| 第54行： | 第54行： | ||
=== German === | === German === | ||
| − | 77.5KHz | + | Freq: 77.5KHz |
| − | DCF77 | + | Code: DCF77 |
| − | PTB | + | Ops: PTB |
* https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77.html | * https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77.html | ||
| 第66行： | 第66行： | ||
<br> | <br> | ||
| − | <br><br><br><br><br><br><br><br><br><br> | + | === Swiss === |
| − | <br> | + | |
| + | Freq: 75KHz | ||
| + | |||
| + | Code: HBG | ||
| + | |||
| + | Ops: METAS | ||
| + | |||
| + | * https://en.wikipedia.org/wiki/HBG_(time_signal) | ||
| + | |||
| + | <br> | ||
| + | |||
| + | == Format == | ||
| + | |||
| + | === BPC === | ||
| + | |||
| + | 载波 68.5KHz，脉宽调制 (Pulse-Width Modulation，PWM)，码率 1 Hz | ||
| + | |||
| + | 每个编码脉冲宽度为 0.1s，0.2s，0.3s 或 0.4s，分别代表四进制的 0，1，2，3。一串四进制的数字是由播发时刻的秒、时、分、星期、日、月、年插入几个校验位组成，长度为 20s | ||
| + | |||
| + | |||
| + | [[文件:BPC-time-frame.png]] | ||
| + | |||
| + | <br> <br> | ||
| + | |||
| + | === JJY === | ||
| + | |||
| + | 载波 40KHz 和 60KHz，脉宽调制 (Pulse-Width Modulation，PWM)，格式类似美国 WWVB 码： | ||
| + | |||
| + | |||
| + | [[文件:WWVB time code format.svg.png | 800px]] | ||
| + | |||
| + | <br> <br> | ||
| + | |||
| + | === WWVB === | ||
| + | |||
| + | 载波 60KHz，脉宽调制 (Pulse-Width Modulation，PWM) 和 相位调制 (Phase Modulation, PM) | ||
| + | |||
| + | |||
| + | [[文件:WWVB time code format.svg.png | 800px]] | ||
| + | |||
| + | <br> <br> | ||
| + | |||
| + | === DCF77 === | ||
| + | |||
| + | 载波 77.5KHz，AM 和 PM | ||
| + | |||
| + | https://en.wikipedia.org/wiki/DCF77 | ||
| + | |||
| + | <br> | ||
| + | |||
| + | == 解调芯片 == | ||
| + | |||
| + | === CME8000 === | ||
| + | |||
| + | * http://www.c-max.com.hk/assets/technology/rct/rct_ic/cme8000/CME8000-B17.pdf | ||
| + | |||
| + | <br> | ||
| + | |||
| + | === CME6005 === | ||
| + | |||
| + | * http://aitendo3.sakura.ne.jp/aitendo_data/product_img/test/D606C/CME6005-A8-1.pdf | ||
| + | |||
| + | <br> | ||
| + | |||
| + | === DL6005 === | ||
| + | |||
| + | * http://www.jfd-ic.com/Documents/DL6005.pdf | ||
| + | |||
| + | <br> | ||
| + | |||
| + | == Reference == | ||
| + | |||
| + | * 可信时间戳服务：https://www.tsa.cn/ | ||
| + | * 中科院国家授时中心：http://www.ntsc.cas.cn/kxcb/kpcg/shijian/201209/t20120921_3648661.html | ||
| + | |||
| + | <br><br><br><br><br><br><br><br><br><br> | ||
2020年8月18日 (二) 14:04的最后版本
目录 |
[编辑] 1 Station
[编辑] 1.1 China
Freq: 68.5KHz
Code: BPC
Ops: NTSC
https://en.wikipedia.org/wiki/BPC_(time_signal)
[编辑] 1.2 Japan
Freq: 40KHz/60KHz
Code: JJY
Ops: NICT
[编辑] 1.3 USA
Freq: 60KHz
Code: WWVB
Ops: NIST
- https://en.wikipedia.org/wiki/WWVB
- https://www.nist.gov/pml/time-and-frequency-division/radio-stations/wwvb
[编辑] 1.4 England
Freq: 60KHz
Code: MSF
Ops: NPL
- https://en.wikipedia.org/wiki/Time_from_NPL
- http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-radio-time-signal
[编辑] 1.5 German
Freq: 77.5KHz
Code: DCF77
Ops: PTB
- https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77.html
- https://en.wikipedia.org/wiki/DCF77
- https://www.eecis.udel.edu/~mills/ntp/dcf77.html
[编辑] 1.6 Swiss
Freq: 75KHz
Code: HBG
Ops: METAS
[编辑] 2 Format
[编辑] 2.1 BPC
载波 68.5KHz，脉宽调制 (Pulse-Width Modulation，PWM)，码率 1 Hz
每个编码脉冲宽度为 0.1s，0.2s，0.3s 或 0.4s，分别代表四进制的 0，1，2，3。一串四进制的数字是由播发时刻的秒、时、分、星期、日、月、年插入几个校验位组成，长度为 20s
[编辑] 2.2 JJY
载波 40KHz 和 60KHz，脉宽调制 (Pulse-Width Modulation，PWM)，格式类似美国 WWVB 码：
[编辑] 2.3 WWVB
载波 60KHz，脉宽调制 (Pulse-Width Modulation，PWM) 和 相位调制 (Phase Modulation, PM)
[编辑] 2.4 DCF77
载波 77.5KHz，AM 和 PM
https://en.wikipedia.org/wiki/DCF77
[编辑] 3 解调芯片
[编辑] 3.1 CME8000
[编辑] 3.2 CME6005
[编辑] 3.3 DL6005
[编辑] 4 Reference
- 可信时间戳服务：https://www.tsa.cn/
- 中科院国家授时中心：http://www.ntsc.cas.cn/kxcb/kpcg/shijian/201209/t20120921_3648661.html
